Fix typo in unstable docs: s/PROGJCT/PROJECT/
Fix typo in unstable docs: s/PROGJCT/PROJECT/

nipunn1313/cargo,rustyhorde/cargo,nipunn1313/cargo,rustyhorde/cargo,eminence/cargo,eminence/cargo,rust-lang/cargo,rust-lang/cargo,rustyhorde/cargo,nipunn1313/cargo,eminence/cargo,nipunn1313/cargo,rust-lang/cargo,rust-lang/cargo,eminence/cargo,rustyhorde/cargo